Hi!
There are more than 1 mapper to an object. Send your mappers configuration.
David
mkhan napsal(a):
> Hi, I am trying get a count for a query but it errors out with
> following message:
>
> Page handler: <bound method Root.index of <harvest.controllers.Root
> object at 0x018444B0>>
> Traceback (most recent call last):
> File "c:\python25\lib\site-packages\cherrypy-2.3.0-py2.5.egg\cherrypy
> \_cphttptools.py", line 121, in _run
> self.main()
> File "c:\python25\lib\site-packages\cherrypy-2.3.0-py2.5.egg\cherrypy
> \_cphttptools.py", line 264, in main
> body = page_handler(*virtual_path, **self.params)
> File "<string>", line 3, in index
> File "c:\python25\lib\site-packages\TurboGears-1.0.5-py2.5.egg
> \turbogears\controllers.py", line 359, in expose
> *args, **kw)
> File "<string>", line 5, in run_with_transaction
> File "c:\python25\lib\site-packages\TurboGears-1.0.5-py2.5.egg
> \turbogears\database.py", line 407, in sa_rwt
> retval = func(*args, **kw)
> File "<string>", line 5, in _expose
> File "c:\python25\lib\site-packages\TurboGears-1.0.5-py2.5.egg
> \turbogears\controllers.py", line 372, in <lambda>
> mapping, fragment, args, kw)))
> File "c:\python25\lib\site-packages\TurboGears-1.0.5-py2.5.egg
> \turbogears\controllers.py", line 401, in _execute_func
> output = errorhandling.try_call(func, *args, **kw)
> File "c:\python25\lib\site-packages\TurboGears-1.0.5-py2.5.egg
> \turbogears\errorhandling.py", line 77, in try_call
> return func(self, *args, **kw)
> File "C:\Documents and Settings\mkhan\workspace\TestAutomation
> \Reports\Harvest\harvest\controllers.py", line 31, in index
> print results2.count()
> File "c:\python25\lib\site-packages\sqlalchemy-0.5.0beta3-py2.5.egg
> \sqlalchemy\orm\query.py", line 1193, in count
> return self._col_aggregate(sql.literal_column('1'),
> sql.func.count,
> nested_cols=list(self._only_mapper_zero().primary_key))
> File "c:\python25\lib\site-packages\sqlalchemy-0.5.0beta3-py2.5.egg
> \sqlalchemy\orm\query.py", line 240, in _only_mapper_zero
> raise sa_exc.InvalidRequestError("This operation requires a Query
> against a single mapper.")
> InvalidRequestError: This operation requires a Query against a single
> mapper.
>
> I would appreciate some comments on what i am doing wrong,
>
> thanks,
>
> mfk
>
> >
>
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